On the performance analysis of mixed multi-aperture FSO/multiuser RF relay systems with interference

In this paper, we consider multi-aperture multiuser dual-hop amplify-and-forward (AF) free-space optical/radio frequency (FSO/RF) communication systems where the FSO and RF links, respectively, experience Málaga M-distribution and Nakagami-m fading. Moreover, the effect of co-channel interference is considered at users. Under the assumption of transmit aperture selection at the source and opportunistic scheduling at the destination, we derive the exact expression for the ergodic capacity in terms of bivariate Meijer's-G function. Additionally, resorting to extreme value theory, we derive closed-form expressions for the asymptotic ergodic capacity, all in terms of Meijer's G and elementary functions, whenever the number of apertures at the source and/or users grows large.